Cook fettuccine according to package directions. Meanwhile, in a Dutch oven, combine the soup, cream cheese, mushrooms, cream, butter and garlic powder. Stir in cheeses; cook and stir until melted. Add the chicken; heat through. Drain fettuccine; add to the sauce.
Transfer to a shallow greased 2-1/2 quart baking dish. Combine topping ingredients; sprinkle over chicken mixture. Cover and bake at 350 degrees for 25 minutes. Uncover; bake 5-10 minutes longer or until golden brown.
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